CN114109908B

CN114109908B - Volute, centrifugal fan and range hood

Info

Publication number: CN114109908B
Application number: CN202010907157.8A
Authority: CN
Inventors: 边乐超
Original assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Current assignee: Foshan Shunde Midea Washing Appliances Manufacturing Co Ltd
Priority date: 2020-09-01
Filing date: 2020-09-01
Publication date: 2023-06-30
Anticipated expiration: 2040-09-01
Also published as: CN114109908A

Abstract

The invention discloses a volute, a centrifugal fan and a range hood, wherein the volute comprises a front plate, a rear plate and a coaming, wherein the front plate and the rear plate are arranged front and back, the coaming is connected between the front plate and the rear plate, the front plate, the rear plate and the coaming jointly define an air outlet cavity, at least one of the front plate and the rear plate is provided with an air inlet, and the coaming is provided with an air outlet; the part of the coaming structure protrudes outwards in the radial direction of the volute to form a diversion trench communicated with the air outlet cavity, and the diversion trench extends in the extending direction of the molded line of the volute and extends to the air outlet. The technical scheme of the invention improves the efficiency of the centrifugal fan in the range hood and reduces the wind noise.

Description

Volute, centrifugal fan and range hood

Technical Field

The invention relates to the technical field of household appliances, in particular to a volute, a centrifugal fan applying the volute and a range hood applying the centrifugal fan.

Background

In the range hood, a fan is an important driving component, in the related art, due to the non-uniformity of impeller air inlet, the air flow in the centrifugal fan volute is not uniformly distributed transversely, and the air flow transversely flows, so that the air flow at the outlet of the volute generates larger vortex, energy loss is caused, and larger pneumatic noise is generated at the outlet.

Disclosure of Invention

The invention aims to provide a volute, which aims to reduce the transverse movement of air flow in the volute, avoid vortex generation at an outlet and improve energy efficiency and reduce noise.

In order to achieve the above purpose, the volute provided by the invention comprises a front plate, a rear plate and a coaming connected between the front plate and the rear plate, wherein the front plate, the rear plate and the coaming jointly define an air outlet cavity, at least one of the front plate and the rear plate is provided with an air inlet, and the coaming is provided with an air outlet;

the part of the coaming structure protrudes outwards in the radial direction of the volute to form a diversion trench communicated with the air outlet cavity, and the diversion trench extends in the extending direction of the molded line of the volute and extends to the air outlet.

According to the technical scheme, the part of the structure of the coaming protrudes outwards in the radial direction of the volute to form the diversion trench communicated with the air outlet cavity, and the diversion trench extends along the extending direction of the molded line of the volute and extends to the air outlet.

Optionally, the diversion trench extends to the air outlet.

Optionally, two ends of the diversion trench extend to two opposite sides of the air outlet respectively.

Optionally, defining a position on the volute, which is opposite to the air outlet in the vertical direction, as a starting point f, wherein the height of the diversion trench in the radial direction of the volute gradually decreases in the direction from the starting point f to the air outlet.

Optionally, in the axial direction of the volute, the diversion trench spans a middle area of the shroud.

In the embodiment, for the characteristic that the flow rate of the air flow in the middle part in the volute is large, most of the air flow in the air outlet cavity is guided to the air outlet by crossing the diversion trench over the middle area of the coaming, so that the transverse movement of the air flow in the air outlet cavity is reduced, the energy efficiency is improved, and the wind noise is reduced.

Optionally, in the axial direction of the volute, the width dimension of the diversion trench is at least two-fifths of the thickness dimension of the volute in the axial direction.

In the embodiment, the width dimension of the diversion trench is set to be at least two fifths of the thickness dimension of the volute in the axial direction, so that air flow can be effectively guided to the air outlet, the energy efficiency is improved, and wind noise is reduced.

Optionally, the shroud comprises a first annular wall, a second annular wall and a third annular wall which are arranged in the axial direction of the volute, a first connecting wall, a second connecting wall and a diversion trench, wherein the first connecting wall is respectively connected with the first annular wall and the second annular wall at two sides, the second connecting wall is respectively connected with the second annular wall and the third annular wall at two sides, and the first connecting wall, the second annular wall and the second connecting wall are enclosed to form the diversion trench;

wherein the second annular wall protrudes further outward in the radial direction of the volute with respect to the first annular wall and the third annular wall.

In this embodiment, the first, second and third connecting walls enclose a flow guiding groove, and the second annular wall protrudes further outwards in the radial direction of the volute than the first and third annular walls, which is structurally easy to realize.

Optionally, the first and second connecting walls extend in a radial direction of the volute.

In this embodiment, the first connecting wall and the second connecting wall, that is, the first connecting wall and the second connecting wall are both vertically arranged with the second annular wall, so that the arrangement is beneficial in that the diversion trench can ensure to have a larger opening, and the step formed by the first connecting wall and the second connecting wall can well block the air flow in the middle of the volute to transversely float to form vortex, thereby achieving the purposes of improving energy efficiency and reducing wind noise.

Optionally, the molded line of the first annular wall and the molded line of the third annular wall are different.

In this embodiment, the molded line of the first annular wall and the molded line of the third annular wall are different, that is, the molded line of the first annular wall and the distance between the third annular wall and the impeller in the fan are different on the airflow traveling path, so that the static pressure can be ensured while the air volume is ensured for the case that the corresponding airflow rates at the first annular wall and the third annular wall in the actual volute are different.

Optionally, the width dimensions of the first and third annular walls are different in the axial direction of the volute.

In this embodiment, under the condition that the corresponding airflow rates at the first annular wall and the third annular wall in the actual volute are different, the different width sizes of the first annular wall and the third annular wall enable the airflow rates to be matched with the airflow rates in the volute, and therefore the consistency of static pressure can be ensured while the air quantity is ensured, and therefore the generation of vortex flow and the wind noise are reduced.

The invention also provides a centrifugal fan, which comprises the volute of any embodiment.

Optionally, the centrifugal fan further comprises a check valve, and the check valve is connected with the volute and communicated with the air outlet.

In the embodiment, the opening degree of the outlet can be kept unchanged, and the air outlet effect is improved.

The invention also provides a range hood, which comprises the centrifugal fan in any embodiment.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic perspective view of an embodiment of a centrifugal fan according to the present invention;

FIG. 2 is a perspective view of the centrifugal fan of FIG. 1 from yet another perspective;

FIG. 3 is an exploded view of the centrifugal fan of FIG. 1;

FIG. 4 is a schematic perspective view of an embodiment of a volute of the present invention;

FIG. 5 is a front view of the volute of FIG. 4;

FIG. 6 is an exploded view of the volute of FIG. 4;

FIG. 7 is a schematic cross-sectional view of the volute of FIG. 4;

fig. 8 is a schematic perspective view of a range hood according to an embodiment of the present invention.

Reference numerals illustrate:

the achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the present invention, unless specifically stated and limited otherwise, the terms "connected," "affixed," and the like are to be construed broadly, and for example, "affixed" may be a fixed connection, a removable connection, or an integral body; can be mechanically or electrically connected; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.

Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.

The present invention proposes a centrifugal fan 500.

In the embodiment of the present invention, as shown in fig. 1 to 3, the centrifugal fan 500 includes a scroll 100, an impeller 200, a motor 300, and a check valve 400, the motor 300 is fixed to the scroll 100, the impeller 200 is disposed in the scroll 100, and the impeller 200 is mounted on a driving shaft of the motor 300. The impeller 200 includes a front plate, a rear plate, and a plurality of blades disposed at intervals along a circumferential direction of the front plate, the blades being respectively connected to the front plate and the rear plate. That is, the blades are circumferentially and uniformly distributed on a plane perpendicular to the front disc and the rear disc, and the blades are mutually parallel. The front disc is generally annular, and an air inlet end of the centrifugal fan 500 is arranged at one end of the front disc, and an air inlet ring is generally arranged at the front disc. The impeller 200 may be a single-layer impeller 200, and for the single-layer impeller 200, a relief hole is formed in the rear plate for the driving shaft of the motor 300 to extend into and fit. The impeller 200 may also be a double-layer impeller 200, for the double-layer impeller 200, the double-layer impeller 200 further includes a middle disc, the middle disc is located between the front disc and the rear disc, and a yielding hole for the driving shaft of the motor 300 to extend into and fit is formed in the middle disc.

An air inlet 100a is formed in the surface of the volute 100 facing the front disc, and the air inlet 100a serves as a main air inlet 100a; the surface of the scroll case 100 facing the rear plate is provided with another air inlet 100a. Generally, when the motor 300 is operated at a high speed, the impeller 200 is a working component of the centrifugal fan 500, the motor 300 is a driving source of the impeller 200, when the impeller 200 is operated at a high speed under the driving of the motor 300, a large negative pressure area is generated in the impeller 200, a part of air flow enters the impeller 200 from the main air inlet 100a under the action of pressure difference, a part of air flow enters the volute 100 from the air inlet 100a of the surface of the rear disk, and two entered air flows enter the volute 100 under the action of centrifugal force of the impeller 200, and finally are discharged through the air outlet 100b of the volute 100.

Referring to fig. 4 to 6 in combination, in the embodiment of the present invention, the volute 100 includes a front plate 110 and a rear plate 120 disposed front and back, and a shroud 130 connected between the front plate 110 and the rear plate 120, where the front plate 110, the rear plate 120, and the shroud 130 together define an air outlet cavity, at least one of the front plate 110 and the rear plate 120 is provided with an air inlet 100a, and the shroud 130 is provided with an air outlet 100b; wherein, the part of the structure of the coaming 130 protrudes outwards in the radial direction of the volute 100 to form a diversion trench 100c communicated with the air outlet cavity, the diversion trench 100c extends in the extending direction of the molded line of the volute 100 and extends to the air outlet 100b, and further, two ends of the diversion trench 100c extend to two opposite sides of the air outlet 100b respectively. The air inlets 100a are provided on both the front plate 110 and the rear plate 120, and the motor 300 may be fixed to the rear plate 120 through a bracket of the motor 300. The check valve 400 is connected with the coaming 130, so that the opening degree of the outlet is kept unchanged, and the air outlet effect is improved. In the above description, the diversion trench 100c extends in the extending direction of the molded line of the volute 100 and extends to the air outlet 100b, specifically, the start position and the stop position of the diversion trench 100c correspond to the portion of the coaming 130 extending spirally, and two ends of the diversion trench 100c extend to two opposite sides of the air outlet 100b, that is, the start position and the stop position of the diversion trench 100c are located at the air outlet 100b, so that when the airflow entering the volute 100 flows along the wall of the air outlet cavity, the airflow can be guided by the diversion trench 100c and finally discharged from the air outlet 100b, thereby realizing that the airflow in the whole air outlet cavity is guided by the diversion trench 100c in the flowing process, and the airflow is not easy to generate transverse flow to generate vortex.

In the technical scheme of the invention, the part of the structure of the coaming 130 protrudes outwards in the radial direction of the volute 100 to form the diversion trench 100c communicated with the air outlet cavity, and the diversion trench 100c extends along the extending direction of the molded line of the volute 100 and extends to the air outlet 100b, because the diversion trench 100c protrudes outwards through the part of the structure of the coaming 130, the structure of the diversion trench 100c and other structures of the coaming 130 can form a step with a height difference, and in the running process of the centrifugal fan 500, the air flow entering the air outlet cavity from the air inlet 100a forms a blocking effect with the step with the height difference and a guiding effect of the diversion trench 100c because the diversion trench 100c is arranged, the air flow is difficult to form vortex in the air outlet cavity due to transverse movement and form vortex in the air outlet 100b, so that the ordered flow of the air flow can be realized, the energy efficiency is improved, and the wind noise is reduced.

In some embodiments, the shroud 130 includes a first annular wall 131, a second annular wall 132, and a third annular wall 133 arranged in an axial direction of the volute 100, and a first connecting wall 134 having two sides connecting the first annular wall 131 and the second annular wall 132, and a second connecting wall 135 having two sides connecting the second annular wall 132 and the third annular wall 133, respectively, the first connecting wall 134, the second annular wall 132, and the second connecting wall 135 enclosing to form the flow guide groove 100c; the second annular wall 132 protrudes further outwards in the radial direction of the volute 100 relative to the first annular wall 131 and the third annular wall 133, and the first annular wall 131, the second annular wall 132, the third annular wall 133, the first connecting wall 134 and the second connecting wall 135 may be integrally constructed, that is, the whole shroud 130 is integrally constructed, so that the manufacturing process is easier, the sealing performance is good, and air leakage is not easy to generate. Of course, the first annular wall 131, the second annular wall 132, the third annular wall 133, the first connecting wall 134 and the second connecting wall 135 may be formed by welding and splicing with other structures of the coaming 130. The solution of the present invention is to pertinently expand the air outlet cavity of the scroll casing 100 based on the structure of the existing scroll casing 100, wherein, in the axial direction of the scroll casing 100, the diversion trench 100c spans the middle area of the shroud 130. In combination with the above, since the airflow in the volute 100 has the characteristic of larger airflow flow rate in the middle, the diversion trench 100c spans the middle area of the coaming 130, so that the cross-sectional area of the discharge flow channel of the airflow is increased for the part with larger airflow rate in the middle of the volute 100, the airflow with larger flow rate entering the air outlet cavity under the centrifugal action of the wind wheel can be timely discharged to the air outlet 100b, and the possibility of generating vortex caused by the transverse flow of the airflow in the axial direction of the volute 100 is reduced.

Referring to fig. 5, in some embodiments, a position of the scroll casing 100 opposite to the air outlet 100b is defined as a starting point f, and a height of the flow guiding groove 100c in the radial direction of the scroll casing 100 gradually decreases in a direction from the starting point f to the air outlet 100 b. The molded lines of this application spiral case are formed by first curve AB, second curve BC, logarithmic spiral line CD, smooth transitional coupling of straight line DE, wherein, f point sets up on logarithmic spiral line CD, spiral case 100 has fully balanced two factors of amount of wind and static pressure through the setting of above-mentioned molded lines for centrifugal fan 500 operation in-process efficiency is higher, the guiding gutter 100c of this application is through reducing gradually in the radial direction of spiral case 100's the high direction from starting point f to air outlet 100b, the molded lines that make guiding gutter 100c formed are assorted with spiral case 100 self molded lines, for example the air current is biggest in the position that corresponds f point, the here sets up the height of guiding gutter 100c at spiral case 100's radial direction for the centrifugal fan operation in-process, the air current has great passageway width here, under the circumstances that so can ensure static pressure, promote the amount of wind. That is, the present application can improve the efficiency of the centrifugal fan 500 while reducing the eddy current in the scroll casing 100 through the diversion trench 100 c.

Optionally, in the axial direction of the volute 100, the width dimension of the diversion trench 100c is at least two-fifths of the thickness dimension of the volute 100 in the axial direction. In this embodiment, the width dimension of the diversion trench 100c is set to be at least two fifths of the thickness dimension of the volute 100 in the axial direction, so that the airflow can be effectively led to the air outlet 100b, the energy efficiency is improved, and the wind noise is reduced.

In some embodiments, the first and second connecting

walls

134, 135 extend in a radial direction of the volute 100. In this embodiment, the first connecting wall 134 and the second connecting wall 135 extend in the radial direction of the volute 100, that is, the first connecting wall 134 and the second connecting wall 135 are perpendicular to the second annular wall 132, so that the opening of the flow guiding groove 100c is a square opening, and in combination with the above, it is understood that the air flow in the air outlet cavity is the largest in the middle area of the volute 100 due to the centrifugal effect of the impeller 200, and the air flow is directly towards the flow guiding groove 100c, and by designing the square opening of the flow guiding groove 100c to have a larger passing space, the air flow entering into the flow guiding groove 100c is easier, and the steps formed by the first connecting wall 134 and the second connecting wall 135 extend in the radial direction of the volute 100, and the air flow is also difficult to flow to cross the first connecting wall 134 and the second connecting wall 135 and the first annular wall 131 and the third annular wall 133 in the process of being led to the air outlet 100b, so that the generation of vortex phenomenon due to the lateral movement of the air flow can be reduced, thereby achieving the purposes of improving the energy efficiency and reducing the noise.

In one embodiment, the profile of the first annular wall 131 is different from the profile of the third annular wall 133. In this embodiment, the curvature of the molded line of the first annular wall 131 or the distance between the molded line of the third annular wall 133 and the impeller 200 in the radial direction is larger than the curvature of the molded line of the third annular wall 133 or the distance between the molded line of the third annular wall 133 and the impeller 200 in the radial direction, and the air flow rate and the static pressure of the air flow at both sides of the guide groove 100c are relatively balanced under the condition that the air flow rate of the area corresponding to the first annular wall 131 is larger than the air flow rate of the area corresponding to the third annular wall 133 under the action of the impeller 200, and the air flow rate and the static pressure of the air flow at both sides of the guide groove 100c are also relatively balanced under the condition that the air flow rate of the area corresponding to the first annular wall 131 is larger than the air flow rate of the area corresponding to the third annular wall 133, and the air flow rate of the air flow rate and the static pressure of the air flow at both sides of the guide groove 100c are relatively balanced under the condition that the air flow rate and the air flow rate of the air flow at both sides of the guide groove 100c is greatly deflected to the first annular wall 132 is greatly, and the air flow rate is greatly deflected to the second annular wall 132 through the corresponding to the maximum point, and the air flow rate of the air flow rate is greatly deflected to the third annular wall 133, and the air flow rate is greatly deflected to the area, and the air flow is greatly deflected to the air flow is opposite to the first side surface is opposite to the first annular wall surface, and the air flow is greatly deflector, and the air flow surface is at the air flow surface is greatly deflector.

In some embodiments, the first and third

annular walls

131, 133 have different width dimensions in the axial direction of the volute 100. In this embodiment, in the same way as described above, since the air flow of the area corresponding to the first annular wall 131 is larger than the air flow corresponding to the third annular wall 133, the width of the first annular wall 131 can be larger than the width of the third annular wall 133, so that the area with large air flow can have a larger cross-sectional area of the discharge channel, and can be matched with the air flow in the volute 100, thereby ensuring the air volume, and improving the consistency of static pressure, so as to reduce the generation of vortex and reduce the wind noise.

Referring to fig. 1 to 7 in combination, the present invention further provides a range hood 600, where the range hood 600 includes a casing 610 and a centrifugal fan 500, the casing 610 has a smoke suction port and a smoke exhaust port, and a smoke exhaust channel communicating the smoke suction port and the smoke exhaust port, and the centrifugal fan 500 is located in the smoke exhaust channel, and the specific structure of the centrifugal fan 500 refers to the above embodiment.

The foregoing description is only of the optional embodiments of the present invention, and is not intended to limit the scope of the invention, and all the equivalent structural changes made by the description of the present invention and the accompanying drawings or the direct/indirect application in other related technical fields are included in the scope of the invention.

Claims

1. The volute is characterized by comprising a front plate, a rear plate and a coaming, wherein the front plate and the rear plate are arranged in front of and behind the volute, the coaming is connected between the front plate and the rear plate, the front plate, the rear plate and the coaming jointly define an air outlet cavity, at least one of the front plate and the rear plate is provided with an air inlet, and the coaming is provided with an air outlet;

the part of the coaming structure protrudes outwards in the radial direction of the volute to form a diversion trench communicated with the air outlet cavity, the diversion trench extends in the extending direction of the molded line of the volute, and two ends of the diversion trench extend to two opposite sides of the air outlet respectively;

and defining the position, which is opposite to the air outlet from top to bottom, of the volute as a starting point f, wherein the height of the diversion trench in the radial direction of the volute gradually decreases in the direction from the starting point f to the air outlet.

2. A volute according to claim 1, wherein the flow guide groove spans a central region of the shroud in an axial direction of the volute.

3. A volute according to claim 2, wherein the width dimension of the flow guide groove in the axial direction of the volute is at least two-fifths of the thickness dimension in the axial direction of the volute.

4. A volute according to any one of claims 1 to 3, wherein the shroud comprises a first annular wall, a second annular wall, a third annular wall arranged in the axial direction of the volute, and a first connecting wall, two sides of which connect the first annular wall and the second annular wall respectively, and a second connecting wall, two sides of which connect the second annular wall and the third annular wall respectively, the first connecting wall, the second annular wall, and the second connecting wall enclosing to form the flow guide groove;

5. A volute as defined in claim 4, wherein the first and second connecting walls extend in a radial direction of the volute.

6. The volute of claim 4, wherein a profile of the first annular wall and a profile of the third annular wall are different.

7. A volute as defined in claim 4, wherein the first annular wall and the third annular wall differ in width dimension in an axial direction of the volute.

8. A centrifugal fan comprising a volute according to any one of claims 1 to 7.

9. The centrifugal fan of claim 8, further comprising a check valve connected to the volute and in communication with the air outlet.

10. A range hood comprising a centrifugal fan as claimed in claim 8 or 9.